England is at war.

Growing up in a lighthouse, Pet's world has been one of storms, secret tunnels and stories about sea monsters. But now the clifftops are a terrifying battleground, and her family is torn apart.

This is the story of a girl who is small, afraid and unnoticed. A girl who freezes with fear at the enemy planes ripping through the skies overhead. A girl who is somehow destined to become part of the strange, ancient legend of the Daughters of Stone ...